Update how-to-add-tables-to-word-processing-documents.md

[lindalu-MSFT]

fix relative URL

[opbld33]

Docs Build status updates of commit 6c87e7d:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
docs/how-to-add-tables-to-word-processing-documents.md	⚠️Warning		Details

docs/how-to-add-tables-to-word-processing-documents.md

• Line 10, Column 16: [Warning-ms-prod-technology-invalid] Invalid value for 'ms.technology': 'open-xml' is not valid with 'ms.prod' value 'office365'.
• Line 2, Column 1: [Suggestion-description-missing] Missing required attribute: 'description'.

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